""" 
# 每个单词的首字母大写
name = "ada lovelace"
print(name.title()) #输出Ada Lovelace

# 将字符串全部改为大写
mizhi = "ada lovelace"
print(mizhi.upper()) #输出ADA LOVELACE """

# 将字符串全部改为小写
mizhi02 = "ada lovelace"
print(mizhi02.lower()) #输出ada lovelace